OF THE MARQUIS OF WORCESTER. 337 



Exchequer and kept there ;&quot; a requirement which he 

 was certain to obey punctiliously, not only to avoid 

 dispute, but because nothing was easier for him to 

 perform, through the agency of Kaltoff. 



Another remarkable point referring to his Engine is 

 that he concludes the 98th article of his Century, which 

 alludes to it, by saying : &quot; I call this a semi-omnipotent 

 Engine, and do intend that a model thereof be buried 

 with me&quot; 



And lastly, there was his practical demonstration on a 

 large scale. As early as May 1654, we have an intima 

 tion of his being in treaty for works at Vauxhall. Not 

 long afterwards we find his workman Kaltoff settled 

 there, and in one of his Petitions he explicitly men 

 tions having spent u 9,000 on buildings and im 

 provements,&quot; and at least &quot; 50,000 in trying expe 

 riments and conclusions of art in that Opera tory :&quot;* 

 thus actually curtailing his personal comforts to fulfil 

 his engagements with all those persons who confided 

 in his promises to perfect his novel undertaking. 



His works and Engine were examined and noticed 

 in 1663, by the French traveller M. Sorbiere; in 1666 

 or 1667 by the eminent mathematician Dr. Eobert 

 Hook, whose cynicism unfortunately thwarted his judg 

 ment; in 1669, by the Grand Duke, Cosmo de Medici; 

 and we find it still in existence in September, 1670, 

 being then alluded to in a letter written by Walter 

 Travers, a Eoman Catholic priest. f 



We have, therefore, certain evidence that the Mar 

 quis of Worcester s Engine was in full operation for at 

 least seven years, and that one of the conditions of the 

 Act of Parliament obliged him to deposit a model in 

 the Exchequer. His own estimate of its value may 



* See page 287. f Appendix D. 



f^ 



